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Before I tackle some of the standard library modules, I ll show you how to explore modules on your own. This is a valuable skill because you will encounter lots of useful modules in your career as a Python programmer, and I couldn t possibly cover all of them here. The current standard library is large enough to warrant books all by itself (and such books have been written) and it s growing. New modules are added with each release, and often some of the modules undergo slight changes and improvements. Also, you will most certainly find several useful modules on the Web, and being able to grok them quickly and easily will make your programming much more enjoyable.1

We are now ready to start up Ruby on Rails and Emporium for the first time, so we tell George to come over and have a look. We don t have to install any separate web servers, like Apache or LightTPD, while developing and testing Emporium. We can use the Ruby on Rails script/server command, which starts an instance of the WEBrick web server.

Once customers review their shopping cart and click Proceed to Checkout, they will be presented with Magento s one-page checkout process. In the first of this process, customers must either checkout as a guest, register, or enter in login information if they are returning customers. Magento allows you to disable the ability for customers to check out as guests. This feature can be disabled from the Magento s administrative section (see Figure 3-14).

Note WEBrick is a Ruby library that allows you to start up a web server with only a few lines of code. WEBrick is suited only for development and testing, not production. In 12, we will show you how to set up and deploy the Emporium project to the LightTPD web server.

The most direct way of probing a module is to investigate it in the Python interpreter. The first thing you need to do is to import it, of course. Let s say you ve heard rumors about a standard module called copy: >>> import copy No exceptions are raised so it exists. But what does it do And what does it contain

Figure 3-14. Step 1 of the one-page checkout process. Customers have the ability to login, register, or checkout as a guest.

Next, execute script/server in the Emporium application directory to start WEBrick. $ cd /home/george/projects/emporium $ script/server => Booting WEBrick... => Rails application started on http://0.0.0.0:3000 => Ctrl-C to shutdown server; call with --help for options [2006-03-19 03:30:50] INFO WEBrick 1.3.1 [2006-03-19 03:30:50] INFO ruby 1.8.4 (2005-12-24) [i686-linux] [2006-03-19 03:30:50] INFO WEBrick::HTTPServer#start: pid=14732 port=3000 WEBrick is now running and configured to handle incoming requests on port 3000. Static content like images, style sheets, and JavaScript files are served by WEBrick from the public directory located under the application root directory. Requests for dynamic content are dispatched to and handled by Ruby on Rails. Open http://localhost:3000 in your browser to see the Emporium application in all its glory. You should see the default Welcome page shown in Figure 1-1. The most interesting thing on the page is the About your application s environment link, which, when clicked, takes you to a page that shows you some technical information about your application.

To find out what a module contains, you can use the dir function, which lists all the attributes of an object (and therefore all functions, classes, variables, and so on of a module). If you try to print out dir(copy), you get a long list of names. (Go ahead, try it.) Several of these names begin with an underscore a hint (by convention) that they aren t meant to be used outside the module. So let s filter them out with a little list comprehension (check the section on list comprehension in 5 if you don t remember how this works): >>> [name for name in dir(copy) if name[0] != '_'] ['Error', 'PyStringMap', 'copy', 'deepcopy', 'error'] The list comprehension is the list consisting of all the names from dir(copy) that don t have an underscore as their first letter. This list is much less confusing than the full listing.